<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>页面B</title>
	</head>
	<body>
		<div align="center" id="div">
		<button type="button" onclick="tao1()">跳转到C</button><br>
		<button type="button" onclick="qian()">前进</button>&nbsp;&nbsp;
		<button type="button" onclick="hou()">后退</button>
		</div>
	</body>
	<script type="text/javascript">
		function tao1(){
			location.href='num1_3.html';
		}
		function qian(){
			history.forward();
		}
		function hou(){
			history.back();
		}
	</script>
</html>
